Res judicata is the generic term for a group of related concepts concerning the conclusive effects given final judgments. Within this general doctrine there are two principal categories: (1) claim preclusion—also known as res judicata; and (2) issue preclusion—also known as collateral estoppel.
These legal doctrines generally preclude litigants from relitigating claims and issues that were previously litigated to a final resolution or judgment.
In New Mexico, res judicata, or claim preclusion, prevents a party from relitigating a claim that has already been finally adjudicated by a competent court. Once a final judgment has been rendered, the same parties cannot bring a lawsuit on the same claim or any other claim arising from the same transaction that could have been brought in the first lawsuit. Issue preclusion, also known as collateral estoppel, bars the relitigation of factual or legal issues that were actually litigated and essential to the judgment in a prior action between the same parties. These doctrines are intended to promote judicial efficiency, respect court decisions, and protect parties from the burden of multiple lawsuits. New Mexico courts will apply these principles to ensure that once a dispute is resolved, it remains settled, provided that the party against whom the doctrine is invoked had a full and fair opportunity to litigate the claim or issue in the previous action.